A factory-built 74 Ventura GTO with an SD-455 is VERY unlikely. First, that engine in that model was not EPA tested, and certainly not EPA approved.
Second, the SD-455 was not being installed in the Van Nuys or Willow Run assembly plants. Just getting one SD-455 from Pontiac to either of these plants would have had to involve monumental paperwork and administrative contortions.
Third, what was PMD going to use for exhaust manifolds on the X-body?
If this car does indeed have a Super Duty between the fenders, it didn't get there in the assembly plant. Might have been a dealer swap using headers.
The application code stamp on the front of the block and the casting date at the rear will tell the tale.
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